Quantitative Aptitude - Arithmetic Ability Questions

Which of the following value of 'x' satisfies the equation 814x+4 = 2432x+8?

What will be the value of r2+p2+s2-rp-ps-rs when r = 4, p = 2, s = 8?

What is the ratio of simple interest earned on certain amount at the rate of 12% for 6 years and that for 12 years?

A flask has two holes. The 1st hole alone makes the flask empty in 9 minutes and 2nd hole alone makes the flask empty in 16 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the flask?

The numbers x, y, z are respectively proportional to 2, 3, 5 and the sum of x, y and z is 80. If the number z is given by the equation z = ax­-8, then a is

13 years ago Ram was twice as old as Sunny. Three years from now Sunny's age will be 3/5 of Ram's age. What is Ram's current age?

The internal bisectors of ∠Q and ∠R of triangle PQR meet at O. If ∠P = 70°, then what is the measure of ∠QOR (in degrees)?

Two circles are drawn with the same centre. The circumference of the smaller circle is 44 cm and that of the bigger circle is double the smaller one. What is the area between these two circles?A. 154 square cmB. 308 square cmC. 462 square cmD. 616 square cm